THE genus which I take the present favourable opportunity to
illustrate, formed a section or sub-genus of the genus Tropidurus,
according
to Weigmann, who, however, was acquainted with two species only; Pr.
Chilensis and Pr. nigromaculatus. Of
the varieties of the former of these, that author has made no less than
three species; but these have been very properly reduced by M. Bibron
to one only. The last-named excellent erpetologist described several
additional species, which had been brought from Chile, by M. D'Orbigny,
and others; and I received, some years since, from Capt. King, three
or
four species which were found by him in the same locality, in the
course of his well-known survey. The number of species altogether,
hitherto known, amounts to ten; to which I have now the opportunity of
adding four entirely new, forming part of the interesting collection of
Reptilia made by Mr. Darwin. One of them, Pr. Kingii, was
already in my collection, amongst those which were given me by Capt.
King. The genus, therefore, of which, but lately, two species only were
known, now consists of fourteen; and it is highly probable that more
may yet be obtained by more prolonged and extensive investigation in
the same districts.

Thus of the species now described two were known to Weigmann, and
described by him, namely, Chilensis, and nigromaculatus.
I
received from Capt. King, Chilensis, pictus, cyanogaster,
Kingii,
Fitzingerii, and, from other sources, Chilensis, pictus,
Weigmannii. Bibron describes the whole of these, excepting Kingii,
and in addition to them tenuis, pectinatus, signifer.
In
Mr. Darwin's collection are found all those described by Bibron,
excepting signifer; and in addition Kingii now
first
described, and the following species never before observed, namely, Darwinii,
gracilis, Bibronii.

Although the form of the whole of the species much more nearly
approximates that of the Agamidæ than most others, they are far
removed from that family by several important characters, which it is
unnecessary here to detail.

DESCRIPTION.—Head short and broad, rostrum rounded, obtuse. Scales
of the head large, and slightly raised, separated by distinct grooves.
Superciliary ridge strongly marked, forming a distinct carina, composed
of five or six narrow, elongated, obliquely imbricated scales. Nostrils
large, nearly round. A single series of narrow scales between those of
the upper lip and the orbit. Scales of the temples imbricated,
rhomboidal and carinated. The opening of the ear oval, rather large,
furnished anteriorly with three or four projecting scales, of which the
upper one is the largest. The neck is short, robust and round, and
without any lateral fold; in which it differs from every other species
of the genus. The trunk is thick, rounded on the back and sides,
flattened beneath, diminishing toward either extremity. The tail is
ordinarily almost twice as long as the body, thick at its origin, and
tapering regularly to the extremity, nearly round, excepting near the
base, where it is slightly quadrilateral. The anterior feet when placed
against the sides, extend backwards little more than mid-way between
the shoulder and the groin; the posterior ones, stretched forward,
reach the arm-pit.

The scales of the whole upper and lateral parts of the body, tail,
and limbs, are loosely imbricated, large, rhomboidal, and furnished
with an elevated carina, terminating in an acute point: those of the
under parts are large, smooth, and obtuse.

This is one of the most beautiful species of the genus. The general
form is robust and solid, forming a remarkable contrast with most other
species of the genus. The surface is beautifully relieved by the fine,
large and prominent scales, which are ranged in rows of perfect
regularity, of which there are about eighteen on the back and side.

In colour and markings the individuals differ considerably; so as
to
have given rise to the opinion that they form three distinct species.
Monsieur Bibron mentions two principal varieties, constituting the Tropidurus
olivaceus and Tr. Chilensis of
Weigmann. In the former, the colour is of a more or less bronzed bright
green, or yellowish, according as the green or yellow colour prevails
on the scales, each of which is green, with a border of yellow on each
side: this border, according to M. Bibron, in some individuals of a
blood-red colour. In some, especially in young individuals, there are
several waved bands running transversely across the back.

In the second variety, says M. Bibron, the upper parts are either of
an olive colour, with a golden glance in certain lights, or fulvous,
with more or less of a yellow tint; and these have always four brown
bands running the length of the body, appearing as if formed of a
series of large spots united together. "The temples are marked with a
black line, which extends from the posterior angle of the eye to the
ear; another divides behind the occiput into two branches, which pass
to the neck there to join the dorsal bands." There are other variations
of colour, but scarcely deserving to be considered as constituting
permanent or fixed varieties; the largest and finest specimen I have
seen, which I received from Chile, is almost uniformly of a fine
metallic green, without any markings.

DIMENSIONS.

Inches.

Lines.

Length

of the
head........................

0

9

of the body
.....................

3

5

of the tail
........................

6

0

————————

Total
length......

10

4

Length

of anterior
extremity............

2

0

of posterior extremity .........

1

2

This species would appear to be very common in Chile, from the
numerous specimens from that country in the museum in Paris, which were
brought by M. Gay, and by M. D'Orbigny. I have also received specimens
from Capt. King. I find only one or two specimens in Mr. Darwin's
collection, which he found at Guasco in Chile.

DESCRIPTION.—This new species is more slender and graceful in its
general form than any other of the genus, not excepting Pr.
tenuis, which
in its general proportions it considerably resembles. The head is
rather short, the anterior portion including the eyes being nearly an
equilateral triangle. The muzzle is rounded. The scales of the head
flat, rather large, consisting behind the nose of three series of 2, 3,
3, and 2, mostly hexagons. The nostrils are small and perfectly round,
the superciliary ridge is very slightly marked; there is but a single
row of small linear scales between the labial and suborbitar. The ear
is of moderate size, the anterior margin having two or three small
projecting scales. The scales on the temples are imbricated and smooth; those of the sides of the neck also imbricated but very small. The neck
is almost wholly without a fold, having merely a slight loose elevation
of the skin. The scales of the back are small, rhomboidal, flat, the
carina low, and not pointed at the extremity. They consist of about ten
rows on each side of the median line. Those of the sides and belly are
wholly without any notch on the free margin. The scales around the
axillæ, and those of the posterior face of the thighs are granular.
The tail is of considerable length, being more than twice the length of
the head and body. The limbs are remarkably long; the anterior, when
pressed against the side, reaching to the setting on of the thigh, and
the posterior reaching forwards nearly to the ear. The general colour
of the upper parts is greyish brown, with a yellow longitudinal fascia
extending on each side from the upper edge of the orbit to some
distance along the tail—and another from beneath the eye to the thigh.
The middle of the back is lighter than the sides—beneath the second
lateral line the colour fades, and on the belly it is pale buff or
light yellow. The sides are dotted with black; and there are some dark
waved lines and dots beneath the lower jaw.

This species is at once distinguished from every other by the fold
of the neck being scarcely cognizable. It is however not so absolutely
wanting as in Pr. Chilensis.

DIMENSIONS.

Inches.

Lines.

Length

of the
head........................

0

5

of the body
.....................

1

4

of the tail
........................

3

8

————————

Total
length......

5

7

Length

of anterior
extremity............

0

7

of posterior extremity .........

1

1

A single individual of this species was taken by Mr. Darwin at Port
Desire.

DESCRIPTION.—This species is moderately slender in its general
form, but more fusiform than Pr. tenuis, which
it much resembles in many of its characters. The head, which is rather
short, and with the snout rounded, is covered with numerous small flat
plates which vary exceedingly in their form and arrangement. The upper
surface of the head is flattened, and the superciliary ridges
distinctly marked. The temples are covered with small flat scales,
which are slightly imbricated and carinated. The sides of the neck are
granulated; and the anterior margin of the auditory cavity has small
simple granulations. The scales of the back are distinguished from
those of many other species by the flatness of the carina which is also
obtuse posteriorly; they are small and closely imbricated. Those of
the
sides are almost without any carina, and those of the belly and throat
small and very smooth, and the whole of them entire. The upper parts of
the limbs are covered with scales similar to those of the back, but
smaller. Those of the under part of the fore arm are similar, but
beneath the thighs they are smooth and on the posterior part of the
thighs they are wholly granular. The tail is furnished with
quadrilateral carinated scales disposed in whorls. The margin of the
cloaca has from two to four pores.

The colour of this species varies greatly. Bibron has enumerated
three principal varieties, of which I have several specimens, which
were brought home and presented to me by Capt. King, who obtained them
during his survey of the coast of South America. These varieties,
however, occasionally run into each other.

Var. A. General colour of the upper part bronzed or coppery, having
a green longitudinal line on each side of the back, at the inner margin
of which is a series of very distinct black dots. The sides of the neck
and body are of a similar colour to the back, with indistinct black
spots; beneath this part the ground colour becomes blue with black
dots. The throat is blackish, and the inferior surface generally is
very pale bluish green.

Var. B. This variety is described by M. Bibron as of a brown colour
more or less dotted with yellow, and having a line of that colour along
each side of the back, extending from the posterior angle of the eye to
the base of the tail, and having on each side a series of angular black
spots. Some of these spots on the upper part of the flanks, become
dilated, so as to form a sort of vertical or transverse waved bands,
with yellowish margins. On the neck there are small black lines, and
the upper part of the head is brown with blackish spots. The upper
surface of the legs and of the tail is brown with transverse bands
composed of black dots. The

whole under surface is of a whitish colour, sometimes having a
slight tint of orange towards the posterior parts, marbled with black.

Var. C. In this variety the general colour is dark brown, and the
yellow or green longitudinal lines which characterize the former
varieties are but slightly marked; but the black spots unite and form
irregular transverse bands.

DIMENSIONS.

Inches.

Lines.

Length

of the
head........................

0

6

of the body
.....................

1

8

of the tail
........................

4

6

————————

7

0

This specimen very much resembles in its more tangible characters,
the Pr. tenuis; from
which, however, it differs totally in the colouring, and in some
measure also in the general form, which is more thick and robust.

Found in Chile by M. Gay, from whence I also received specimens from
Capt. King, and other sources.— "Valparaiso." Mr. Darwin.

DESCRIPTION.—General form resembling that of Pr. pictus and
cyanogaster. Head
moderately short, obtuse, covered with rather large slightly convex
scales; a single row of scales between the labial and the orbitar. The
anterior margin of the ear has a single tooth. The temples and the
sides of the neck are covered with imbricated scales, which have no
carina—those of the neck, especially those on the fold of the skin are
smaller and more raised than the others. The scales of the back are
rather large, rhomboidal, with a distinct carina, terminating in a
point. Those of the abdomen and sides are all of them entire at the
margin. The posterior surface of the thighs is wholly granular.

The only specimen obtained being a female, the number of pre-anal
pores is not known.

The general colour of this species is brownish grey; a black
longitudinal line runs down the middle of the back and tail. There are
two series of black spots on each side, and a

small interrupted fascia of the same colour extends from the
shoulder to the thigh. The belly is of an uniform dirty white.

This species approaches considerably to Pr. cyanogaster in
general form and habit, and in many of its characters; but it may be
at
once distinguished from it not only by its colouring, but by the
absence of even the slightest appearance of a carina on any of the
scales of the temples or of the sides of the neck.

DESCRIPTION.—General form slender: head rather short and obtuse,
covered with flattened smooth scales; anterior margin of the ears with
one or more slight tubercles; temples covered with rounded imbricated
scales, some of which are slightly carinated; sides of the neck, and
above the shoulders granular; scales of the back small, slightly
carinated, obtuse; those of the sides very small, very little
imbricated; those of the belly small and smooth. The posterior surface
of the thighs has no patch of imbricated scales, but is wholly granular.

The colour of the two specimens brought home by Mr. Darwin is so
much obliterated, that I am obliged to have recourse to the account
given by Bibron of the colour and markings of this species: — "Les
deux sexes du Proctotréte svelte n'ont pas le même mode
de
coloration. Ni l'un ni l'autre ne portent, de chaque côté du dos, une
bande longitudinale verte ou jaunâtre comme cela s'observe dans
l'espèce précédente, ( Pr. pictus. )

the labial scales, and the long infra-orbital plate is a single
series of rounded scales.* The scales of the temples are rather large,
somewhat rounded, slightly imbricated, and a few of the posterior ones
having the vestige of an obtuse carina. The ear is rather small, the
anterior margin having two slightly prominent scales towards the lower
part.

The body is depressed; the tail moderately long, thick and slightly
four-sided at the base, becoming much smaller and round towards the
middle. The scales of the sides of the neck are small and granular; those of the upper parts of the body small, rhomboidal, rounded
posteriorly, loose, much imbricated, and with an extremely low and
inconspicuous carina. They are arranged in about twenty-two
longitudinal series. Those of the sides are larger and quite smooth.
The scales of the whole under part of the throat and belly are
rhomboidal, smooth and much imbricated; a very few towards the sides
of
the abdomen are slightly notched at the apex. The under surface of the
anterior and the hinder surface of the posterior extremities are
covered with very fine granular scales; those of the upper surface of
the members being rhomboidal, smooth, but slightly carinated and
obtuse. The tail is covered with small rhomboidal scales which are
considerably imbricated and distinctly carinated. The scales of the
upper surface of the toes are smooth; those on their sides
uni-carinated, and those beneath tri-carinated and broad.

The general colour of the upper parts is a yellowish grey, with
black markings, which have somewhat the character, as Mons. Bibron
observes, of Arabic letters. On the neck and back these markings are
disposed in four longitudinal series; and there are small linear
markings on the upper part of the shoulders and thighs. The tail is
similarly marked, the under parts are whitish, with brown lines and
spots.

DIMENSIONS.

Inches.

Lines.

Length

of the
head ........................

0

6

of the body
.....................

1

5

of the tail
........................

3

0

————————

Total
length......

5

1

Length

of anterior
extremity............

0

8

of posterior extremity .........

1

2

This species is not found amongst the reptiles obtained by Mr.
Darwin, but as it has never been figured, it appeared very desirable
that this opportunity should not be lost. I am indebted to the great
kindness of my friend M. Bibron for the loan of the only specimen which
I have seen, and from which the accompanying figure is taken. It formed
part of the zoological collections obtained by Mons. D'Orbigny for the
French Museum.

* Mons. Bibron states that there are two series, but
on examining
his specimen I find a single series only.

DESCRIPTION.—Head short, the muzzle rounded, rather obtuse; scales
of the upper part of the head somewhat convex, smooth; a single line
of
scales between the labial and orbitar; ears rather large, the anterior
margin having three rather prominent scales, the middle one being the
largest. Temporal scales somewhat large, smooth, rounded, and
imbricated, those towards the upper part slightly carinated; those of
the sides of the neck thick and elevated, those on the fold being
rather acutely prominent; scales of the back carinated, the carina
terminating in an acute point; a few of the scales at the sides of the
abdomen and throat notched; the remainder of the scales of the under
parts rhomboidal. The scales about the axilla and around the base of
the shoulder are granular and very small, as are those of the posterior
surface of the thighs, on which part there are no imbricated scales as
in Tr. Fitzingerii. The tail is round, excepting at the base
where it is slightly flattened; it is moderately long and slender. The
anterior extremity placed against the side does not reach to the thigh; the posterior similarly placed reaches to the shoulder. The colour of
this species is yellowish grey above, with a yellowish longitudinal
line on each side the back, and two rows of black spots each margined
with yellow behind. There is a large and distinct oblong black mark on
the region of the scapula, from which circumstance the species takes
its name. On the posterior surface of the thighs, towards the upper
part, are three or four black dots placed in a line. The under surface
is yellowish white with dark grey dots and lines under the chin and
throat.

DIMENSIONS.

Inches.

Lines.

Length

of the
head........................

0

5

of the body
.....................

1

5

of the tail
........................

2

8

————————

Total
length......

4

8

Length

of anterior
extremity............

0

8

of posterior extremity .........

1

2

This species was first described by Weigmann, and subsequently by M.
Bibron, from specimens obtained by Gaudichaud from Coquimbo, at which
place the single specimen brought home by Mr. Darwin was also obtained.

DESCRIPTION.—General form thick and robust, the head short being
nearly as broad as it is long. The muzzle slightly rounded. Scales of
the head flat, small and numerous. Two scales only behind the rostral
and between those which are pierced by the nostrils. Those over the
nose and around the occipital scales being larger and more regularly
arranged than the others. The ear is large, oval, the anterior margin
having, towards the upper part, about three small, oval, granular, very
slightly projecting scales. Temples covered with small, rounded or
slightly hexagonal scales, which are scarcely imbricated. A single
range of rather broad oval scales between the orbit and the upper lip.
Scales of the sides of the neck, and above and behind the shoulder
small, granular. The trunk thick; scales of the back very small,
imbricated, very slightly carinated, and not pointed behind; those of
the under parts smooth and rhomboidal. The legs are short and robust.
The anterior pair, placed against the side do not extend backwards more
than halfway to the thigh. The posterior pair do not quite reach the
arms. The posterior face of the thighs is covered with granular scales,
excepting a large patch near the groin rising to near the upper surface
of the thigh, which are imbricated and rhomboidal, similar to those of
the inferior surface of the thigh. The scales of the upper part of the
toes are smooth, those beneath have one or two slight carinæ.

This species varies very much in colour; three or four tolerably
distinct varieties may be noticed, but they often pass more or less
into each other. As I have only one of these varieties in my
possession, I quote the following description from Mons. Bibron's
account of the specimens in the French Museum.

This species agrees with Pr. Darwinii and Weigmannii,
and
in some degree with Pr. Kingii, in
having a portion of the posterior face of the thighs covered with
imbricated scales. This is a character, which although existing in all
those which I have named, is found to obtain in very different degrees; in Tr. Weigmannii being very distinctly marked, and in Tr.
Kingii very
slightly so, and in some specimens scarcely notable. It is probable,
that var. B., and possibly A. also, of Mons. Bibron, may be Pr.
Kingii; but I have not had the opportunity of ascertaining this
from the actual examination of the specimens.

DESCRIPTION.—It has been well observed by M. Bibron that this
species offers at first sight somewhat the general aspect of the genus
Algira; the acute points of the dorsal and lateral scales and the
general form giving very much that appearance.

The head is of moderate size, somewhat deflexed; the scales
moderate, flat and smooth; those of the temples are slightly
carinated,
imbricated and rounded: those of the sides of the neck small, not
granular, but rhomboidal and imbricated. There is but a single series
of oblong scales between the labial ones and the orbit. The margin of
the ear is entire and simple; the

scales of the back are lozenge-shaped, the carina of moderate height
but prolonged into an acute point. Amongst those of the sides of the
neck and belly are a few which are notched at the margin.* The scales
of the posterior surface of the thigh are wholly granular.

The proportions of the limbs vary in the two sexes. In the male they
are considerably longer than in the female. In the latter the posterior
extremity when placed against the side extends only to the arm, in the
former it reaches to the ear. The ground colour of the back is chesnut
brown or greenish brown, with a bright metallic green glance in certain
lights; there are two light buff longitudinal fasciæ running the whole
length of the body; the under parts are of a bright metallic blue
colour. Mr. Darwin states that in one specimen there were emerald spots
on the sides, which did not exist in another individual. This may
possibly be a sexual peculiarity.

DIMENSIONS OF A MALE
SPECIMEN.

Inches.

Lines.

Length

of the
head........................

0

6

of the body
.....................

1

9

of the tail
........................

3

3

————————

Total
length......

5

8

Length

of anterior
extremity............

1

0

of posterior extremity .........

1

5

Found by Mr. Darwin at Valparaiso, and at Valdivia; the former is a
very dry rocky country, with a scanty vegetation; whereas the latter
is
nearly level, covered with the thickest forest, and the climate
exceedingly humid.

DESCRIPTION.—General form robust and full; the head short, thick,
and passing into the neck without any distinct contraction; the muzzle
rounded. Scales of the head larger in proportion than in Pr.
Fitzingerii. Ear
large, oval, with the anterior margin granular, sometimes slightly
toothed. Scales of the temples of moderate size, imbricated, smooth,
somewhat raised. A single range of oval moderate-sized scales between
the labial and the orbital scales on the

* This is contrary to the character given by M.
Bibron, who states
that the whole of these are entire.

sides of the neck, above and behind the shoulder small, granular,
and some of them having a minute pore. Scales of the back of moderate
size, larger than in Fitzingerii, rhomboid, having a rather
prominent carina, and terminating in a distinct point. Scales of the
under parts smooth and rhomboidal. The posterior surface of the thighs
is for the most part granular, but a small portion near the groin is
covered with larger imbricated scales; to a much smaller extent,
however, than in Fitzingerii, and other species which
possess this character.

The general colour of the upper part of this species is a rich dark
brown, with whitish transverse bands and spots, having a black margin.
I have figured in fig. 2, of Plate VI., a remarkable variety in which
the bands are alternate black and white, and a broader and a narrower
longitudinal fascia of a yellowish-white colour, run the whole length
of the body on each side. The under parts are yellowish-white, with
dark or almost black spots; under the throat bluish-gray with white
spots.

DIMENSIONS.

Inches.

Lines.

Length

of the
head........................

0

8

of the body
.....................

2

3

of the tail
........................

3

4

————————

Total
length......

6

5

Length

of anterior
extremity............

1

1

of posterior extremity .........

1

4

This species much resembles Pr. Fitzingerii in many of
its
characters, as well as in its size. It may, however, be at once
distinguished from it by the character of the scales of the back, which
in this species are very distinctly carinated, of a rather elongated
form, and pointed at the extremity; whereas in the other they are
shorter, smaller, the carina is very slight, almost indistinct, and the
posterior extremity is obtuse.

The tail in the larger figure of our plate is deformed, having been
renewed. The specimen figured at ( 2,) in the same plate, is so
remarkably distinct in the colours and marking, as to lead me to
suppose that it may possibly be a different species.

DESCRIPTION.—The general form of this new species is similar to that
of Pr. Weigmannii, but
less elongate and somewhat more depressed, resembling in general
appearance some of the forms of the genus Sceloporus. Head covered with
rather small and consequently numerous scales, slightly elevated, and
separated from each other by distinct and deep lines. A single series
of small scales between the labial scales and the orbit. The exterior
margin of the ear is entire and even. Scales of the temple and at the
sides of the neck wholly granular, the latter very small. The scales of
the back are small, flat, with a very low carina, and not pointed at
the posterior extremity. There are about twenty rows of dorsal scales.
The posterior surface of the thighs is granulated, excepting a small
patch near the tail of imbricated scales, similar to those of the
inferior surface, as in Pr. Weigmannii. The tail is of
moderate
length, and the scales which cover it are short, depressed, and obtuse
in comparison with those of several other species. The pre-anal pores,
which are peculiar to the male, are about ten in number.

The general colour is gray, with two light longitudinal lines on
each side, and a row of black spots along the inner margin of the
dorsal ones. The under surface is nearly white, with black dots under
the throat.

The anterior legs, when stretched backwards against the side, reach
about two-thirds towards the thigh; and the posterior when stretched
forwards, extend to the shoulder.

DIMENSIONS.

Inches.

Lines.

Length

of the
head........................

0

5

of the body
.....................

1

6

of the tail
........................

3

4

————————

Total
length......

5

5

Length

of anterior
extremity............

0

8

of posterior extremities
.........

1

2

It is at first sight extremely difficult to distinguish this species
from younger individuals of Pr. Fitzingerii, from
which, however, it differs in the more linear form of the supralabial
scales, in the absence of imbricated scales on the lateral fold of the
neck, the more entire margin of the ear. In the existence of a patch of
larger imbricated scales on the posterior surface of the thighs, it
resembles Pr. Weigmannii; from which, however, it may be at
once distinguished by the single row of supralabial scales, the later
species having a double row.

DESCRIPTION.—Head rather short, covered with numerous slightly
raised scales, not carinated nor imbricated; snout rather obtuse and
slightly rounded, nostrils semicircular. Two series of very small
scales between the labial scales and the orbit. Ear of moderate size,
the anterior margin furnished merely with minute granular scales.
Scales of the temples flat and smooth. Fold on the sides of the neck
distinctly marked, anteriorly bifurcated; the remainder somewhat
waved. Sides of the neck granulated scales of the whole of the upper
and back parts of the body and tail of moderate size, the carina little
elevated and the point but slightly prominent. The scales of the
inferior parts of the neck and body are smooth, polished, and
imbricated, those towards the sides of the neck minutely emarginated.
The scales of the limbs resemble those of the body; those of the upper
surface being carinated and those beneath smooth. The posterior face of
the thighs is generally covered with granular scales, but there is on
this part near the tail, a distinct patch of imbricated scales
resembling those of the inferior surface of the thighs, a character by
which this species may at once be distinguished from all others. The
anterior extremity placed against the side reaches about two-thirds of
the distance towards the groin; the posterior extremity reaches
forward
to the shoulder.

COLOUR.—The back and sides are brownish gray, with a yellow
longitudinal band on each side of the back, separating transverse black
or dark brown bands of various size and form; and there is in most on
each side a smaller interrupted yellow band. The under parts generally
of a yellowish white, in some individuals sparsely dotted with black.
Mr. Darwin says of some individuals of this species that they have "an
orange-coloured gorge, and faint stripes of blue," also "ash-grey with
dark brown marks and specks of orange and blue."

DIMENSIONS.

Inches.

Lines.

Length

of the
head........................

0

5

of the body
.....................

1

5

of the tail
........................

2

2

————————

Total
length......

4

2

Length

of anterior
extremity............

1

1

of posterior extremity .........

0

8

This species was found by Mr. Darwin at Bahia Blanca and at Rio
Negro, on the northern confines of Patagonia, and at Maldonado, near
the mouth of the Rio Plata.

BY
RICHARD
OWEN, ESQ. F.R.S.
Professor of Anatomy and Physiology to the Royal
College of Surgeons, London.
WITH A GEOLOGICAL INTRODUCTION,
BY CHARLES DARWIN, ESQ. M.A., F.R.S.This Division of the Work is now complete,
Price £1 10s.

BY
JOHN
GOULD,
ESQ. F.L.S.
WITH A
NOTICE OF
THEIR HABITS AND RANGES,
BY CHARLES
DARWIN,
ESQ. M.A., F.R.S.This Division of the Work is now complete,
Price £2 15s.

~~~~~~~~~~~~~~~~

~~~~~~~~~~~~~~~~

NOS.
II.
IV.
V. AND
X.

NOS.
XII.
XIV. XVI. AND XVII.

MAMMALIA,

BY
GEORGE
R. WATERHOUSE, ESQ.
Curator of The Zoological Society of London, &c.This Division of the Work is
now complete,
Price £1. 18s.

FISH.
BY THE REV.
LEONARD JENYNS, M.A., F.L.S.This Division of the Work is now complete,
Price £1 14s.

*** The whole of the Plates are
engraved
in the
highest style of Art, from Drawings taken expressly for this Work,
and most of them beautifully coloured after Nature.

——————————————

NOW PUBLISHED, WITH THE APPROVAL OF
THE LORDS COMMISSIONERS OF HER MAJESTY'S
TREASURY.

THE STRUCTURE AND DISTRIBUTION

OF

CORAL REEFS;

Being
the First Part of the Geological Observations made during the "Voyage
of the Beagle" in the years 1832 to 1836, under the command of Capt.
FITZROY, R.N.

BY

CHARLES DARWIN,
M.A., F.R.S., F.G.S., ETC.

NATURALIST TO THE EXPEDITION.

——————

IN ONE VOLUME
DEMY OCTAVO, ILLUSTRATED WITH WOODCUTS AND MAPS. PRICE 15s.